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Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jan. 31, 2018
Jul. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 30,622 $ 30,622
Accumulated Amortization (28,591) (28,297)
Net Amount 2,031 2,325
Developed Technology Rights    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 29,882 29,882
Accumulated Amortization (28,520) (28,266)
Net Amount $ 1,362 $ 1,616
Developed Technology Rights | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life 6 years 6 years
Developed Technology Rights | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life 20 years 20 years
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life 20 years 20 years
Gross Carrying Amount $ 670 $ 670
Accumulated Amortization (45) (8)
Net Amount $ 625 $ 662
Trade Names Titan    
Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life 10 years 10 years
Gross Carrying Amount $ 70 $ 70
Accumulated Amortization (26) (23)
Net Amount $ 44 $ 47